sblock Elements 1 Question 18
18. The isotopes of hydrogen are
(2019 Main, 9 Jan I)
(a) deuterium and tritium only
(b) protium and deuterium only
(c) protium, deuterium and tritium
(d) tritium and protium only
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Answer:
Correct Answer: 18. (c)
Solution: There are three known isotopes of hydrogen, each possessing an atomic number 1 and atomic masses 1,2 and 3 respectively. These are named as protium $\left({ }^1 \mathrm{H}\right)$, deuterium $\left({ }^2 \mathrm{H}\right.$ or D) and tritium ( ${ }^3 \mathrm{H}$ or T)
The most common isotope is the ordinary hydrogen usually called protium. It consists of one proton in the nucleus and an electron revolving around it.
The second isotope of hydrogen is called heavy hydrogen or deuterium. It consists of one proton and one neutron in the nucleus and an electron revolving around it. The third isotope of hydrogen is called tritium. It consists of one proton and two neutrons in the nucleus and an electron revolving around it.
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